Measurement ±640 mV

Measurement mode

±640 mV

Measuring range, nominal

-640…+640 mV

Measuring range, end value (FSV)

640 mV

Measuring range, technically usable

-687.2…+687.2 mV

PDO resolution (including sign)

24 bit

16 bit 2)

PDO LSB (Extended Range)

81.92 nV

20.97152 µV

PDO LSB (Legacy Range)

76.29.. nV

19.53.. µV

Input impedance ±Input 1

(internal resistance)

Differential typ. 4.12 MΩ || 11 nF

CommonMode typ. 40 nF against SGND

2) The analog measurement is always done with 24 bits, in 16-bit mode the eight least significant bits are cut off. For further information see chapter “Commissioning”/ “Process data overview”

Specific data

Measurement mode

±640 mV

Data preliminary = X

Basic accuracy: Measuring deviation at 23°C, with averaging 3)

< ±0.005 %, < ±50 ppmFSV typ.

< ±32.0 µV typ.

 

Extended basic accuracy: Measuring deviation at 0…55°C, with averaging 3) 6)

< ±0.0095 %, < ±95 ppmFSV typ.

< ±60.8 µV typ.

 

Offset/Zero point deviation (at 23°C) 3)

EOffset

< 20 ppmFSV

 

Gain/scale/amplification deviation (at 23°C) 3)

EGain

< 40 ppm

 

Non-linearity over the whole measuring range 3)

ELin

< 25 ppmFSV

 

Repeatability, over 24 h, with averaging 3)

ERep

< 5.0 ppmFSV

 

Temperature coefficient 3)

TcGain

< 2 ppm/K typ.

 

TcOffset

< 1.5 ppmFSV/K typ.

< 0.96 µV/K typ.

 

Noise (without filtering)

ENoise, PtP

< 70 ppm FSV

< 547 digits

< 44.80 µV

 

ENoise, RMS

< 12 ppm FSV

< 94 digits

< 7.68 µV

 

Max. SNR

> 98.4 dB

 

Noisedensity@1kHz

< 0.11 Measurement ±640 mV 1:

 

Noise (with 50 Hz FIR filter)

ENoise, PtP

< 12 ppm FSV

< 94 digits

< 7.68 µV

 

ENoise, RMS

< 2.0 ppm FSV

< 16 digits

< 1.28 µV

 

Max. SNR

> 114.0 dB

 

Common-mode rejection ratio (without filter)

DC: >115 dB typ.

50 Hz: >105 dB typ.

1 kHz: >80 dB typ.

X

Common-mode rejection ratio (with 50 Hz FIR filter)

DC: >115 dB typ.

50 Hz: >115 dB typ.

1 kHz: >115 dB typ.

X

Largest short-term deviation during a specified electrical interference test

±0.03% = 300 ppm FSV typ.

X

3) Valid for ELM3702-00x0 and ELM3704-00x0 from HW01; Valid for ELM3704-10x1 from HW01 except 20 mA, 0‑5 V and 0‑10 V measuring ranges. Specifications of predecessor-HW on request.

6) Calculated value according to equation in chapter "General information on measuring accuracy/measurement uncertainty" for quick estimation of usability over the specified ambient temperature range in operation (Tambient). In real use, for example at a relatively constant ambient temperature Tambient, a lower (better) achievable uncertainty is attained. A specific calculation according to chapter "General information on measuring accuracy/measurement uncertainty" is recommended, especially if the instrument allows a wider ambient temperature range in operation than 0...55 °C.

Measurement ±640 mV 2:Fig.15: Representation ±640 mV measurement range

Note: In Extended Range Mode the Underrange/Overrange display in the PDO status has the character of an information/warning when the nominal measuring range is exceeded, i.e. no Error is displayed in the PDO status and LED. If the technical measuring range is also exceeded, Error = TRUE is also displayed. The detection limit for Underrange/Overrange Error can be set in the CoE.

In Legacy Range mode, an Underrange/Overrange event also leads to an Error in the PDO status.